Quantum Physics

Delayed Choice and Weak Measurement in the Nested Mach-Zehnder Interferometer

This note discusses recent weak measurements of the nested Mach-Zehnder interferometer, measurements that can be interpreted in terms of state vectors traveling both forwards and backwards in time. A complementary interpretation is presented, from the perspective of the scale invariant quantum Hall and far field photon impedances. A delayed choice variant on the recent experiment is proposed, distinguishing between these two and other interpretations.

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